CRL 5/8" x 1" x 4" Thermoplastic Rubber (TPR) Setting Blocks Finish:Black Recommended gap between the lites

Recommended gap between the lites of glass is 1/4" (6 mm)

It is designed for conventional glazing of glass and plastic

The black color helps to disguise the backer rod in certain joint applications

Easily slips on and off T-bar frame

This kit features the 4-in-1 Powerful Window Energy Profiler

CRL 5/8" x 1" x 4" Thermoplastic Rubber (TPR) Setting Blocks Finish:Black Recommended gap between the litesCompatible With Silicone, Butyl, Polyurethane, and Polysulfide Sealants UV Stabilized CRL Thermoplastic Rubber (TPR) Setting Blocks are compatible with almost anything, meaning you can use them in designs calling for the use of modern structural glazing sealants. They are formed of a 90 durometer shore hardness thermoplastic rubber that performs as well as traditional neoprene setting blocks. They are available in the most popular sizes of neoprene