how many feet come in a 3 pk?

Both INDIVIDUAL packs - the 3/8" and the 1/2"- are 20 feet long.

no 1/4" one? either 20 or 50ft?

Not in this brand, but Amazon offers 1/4-inch backer rod in various lengths, from 10 feet to 100 feet, from other brands. Just search on "Backer Rod 1/4 Inch".

can the backer rod be sliced for smaller openings?

I have not done that, but it cuts easily with a sharp knife or scissors, so you should be able to slice it to fit whatever opening you have. It's good stuff!

Can his be used for exterior windows before caulking?

I used it to push into larger cracks in my driveway before applying concrete filler, and it worked great. I'm thinking that it should work well for filling in spaces around your windows prior to caulking.

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🛠️ Seal Smart, Save Big – The Pro’s Secret to Flawless Finishes!

LONG LASTING COVERAGE - Generous 20-foot length ensures you have enough material to tackle multiple projects without constant reordering.
DRAFT PROOF YOUR SPACE - Effectively fills large gaps and expansion joints to prevent drafts, enhancing energy efficiency and comfort.
PERFECT FIT EVERY TIME - Precisely sized 3/8-inch diameter for seamless gap filling and professional-grade caulking support.
CUSTOMIZABLE EASY TO USE - Easily trimmed with scissors and twistable for extra-large gaps, giving you ultimate control and flexibility.
TRUSTED AMERICAN CRAFTSMANSHIP - Manufactured in the USA with durable, closed-cell polyethylene foam for reliable, non-absorbent performance.

The M-D Building Products Versatile Gray Foam Backer Rod is a 3/8-inch diameter, 20-foot long closed-cell polyethylene foam rod designed to provide a sound surface for caulking in concrete gaps, expansion joints, and crack filling. Made in the USA, it prevents drafts, improves energy efficiency, and is easily trimmed or twisted for custom applications, making it an essential tool for professional and DIY weatherization projects.

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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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Manufacturer	M-D Building Products
Part number	71464
Item Weight	17 g
Product Dimensions	35.56 x 20.32 x 5.08 cm; 17.01 g
Item model number	71464
Size	20 Ft.
Color	Black
Style	Backer Rod
Material	Rubber
Pattern	Solid
Shape	Round
Item Package Quantity	1
Number Of Pieces	1
Measurement System	US
Specification met	Non-absorbent, closed-cell polyethylene pre-caulking material
Included components	MD Building - 71464 - 2pk
Batteries Included?	No
Batteries Required?	No

M-D Building Products - Versatile Gray Foam Backer Rod - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling, 3/8 by 20 Feet (71464)

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