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RELIABILT 1-in x 4.5-in Primed MDF Plinth Block

Name: RELIABILT 1-in x 4.5-in Primed MDF Plinth Block
Brand: RELIABILT
SKU: 1000299377
Price: 1.98 USD
Availability: InStock
Rating: 4.8 (31 reviews)

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Use RELIABILT decorative plinth blocks to easily add a classic look to your doorways. The primed white surface is ready to install and paint the color of your choice. Makes your installs easier and quicker, don't worry about the tricky miter cuts between your door casing and baseboard moulding, all you need are straight cuts.

Manufactured from MDF (medium density fiberboard)
Primed and ready to paint a color of your choice
Each block measures 15/16-in thick x 2-3/4-in wide x 4-1/2-in tall long
Designed to decoratively transition between door casing and baseboard moulding
Makes moulding installations easier
Available in 2-3/4-in x 4-1/2-in and 3-3/4-in x 6-1/2-in heights
Trims with common woodworking tools, install with finish nails
Designed for interior use

General
Color/Finish Family	White	Manufacturer Color/Finish	White
Installation Type	Finishing nails or brad nails	Material	MDF
Finish	Primed

Dimensions
Actual Thickness (Inches)	0.938	Actual Height (Inches)	4.5
Actual Width (Inches)	1

Features
Moisture Resistant	No	Paintable/Stainable	Paintable
Finger-Joint	No	Flexible	No

Certifications
CA Residents: Prop 65 Warning(s)	Prop 65 WARNING(S) -	No Added Formaldehyde (NAF) Compliant	Yes
CARB Compliant	Yes

Warranty
Warranty	None

Miscellaneous
UNSPSC	30161900

Check out the Best Selling Plinths on Lowes.com

Review

4.8 out of 5

31 Reviews

3 Star

2 Star

94% Recommend this product

Ratings may include incentivized customer reviews.

31 Customer Reviews

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Unconventional use but perfect for my purpose.

Would Recommend

I needed blocks to shape the wood epoxy I’m using to repair my vintage furniture. This block has the smooth surface that I need and its also the right size. I’m also pleased that the price is reasonable!

ziggyOctober 1, 2026
Verified PurchaserIncentivized

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Elegant

Would Recommend

These were perfect for fixing small dents at the bottom of our door frame casing and they also have an elegant look to it. Would definitely recommend putting these in your house.

BecaSeptember 19, 2026
Verified PurchaserIncentivized

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/6040af0e-b96b-5fa9-bd1b-30a1c75b9a8c

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Great Item

I purchased these items a month and anxious to get them installed

EgomaniacSeptember 14, 2026
From 1-in x 6-in Primed MDF Plinth Block Verified Purchaser

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Great eye appeal

Great product, adds a lot to product appeal

RobinSeptember 2, 2026
Verified Purchaser

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Add the plinth blocks!

Would Recommend

These plinth blocks added such a nice touch to my door trim.

Kth33August 17, 2026
From 1-in x 6-in Primed MDF Plinth Block Verified PurchaserIncentivized

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/a5fab304-443b-533d-b578-8b9186848c5b

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Would Recommend

Paintability is great, smooth finish. Mechinability with rough backing for adhesion.

Blue1967August 10, 2026
Verified PurchaserIncentivized

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COMPARE PRODUCTS

		Name	Current Item RELIABILT1-in x 4.5-in Primed MDF Plinth Block
		Ratings	31
		Material	MDF
		Actual Width (Inches)	1
		Finish	Primed
RELIABILT1-in x 6-in Primed MDF Plinth Block	Ornamental Mouldings3.75-in x 6-in Primed White hardwood Plinth Block	2.75-in x 4.5-in Primed Oak Plinth Block	Ornamental Mouldings8-in x 4.5-in Unfinished Poplar Plinth Block	Ornamental Mouldings2.5-in x 5.75-in Unfinished White hardwood Plinth Block	Ornamental Mouldings3.375-in x 6-in Unfinished Oak Plinth Block	Ornamental Mouldings3.5-in x 6.5-in Unfinished White hardwood Plinth Block	Ornamental Mouldings2.75-in x 4.5-in Unfinished Oak Plinth Block	Ornamental Mouldings3.25-in x 6.5-in Unfinished Red oak Plinth Block
31	28	8	19	17	6	18	1
MDF	Wood	Wood	Wood	Wood	Wood	Wood	Wood	Wood
1	3.75	2.75	8	2.5	3.375	3.5	2.75	3.25
Primed	Primed	Primed	Unfinished	Unfinished	Unfinished	Unfinished	Unfinished	Unfinished