Need to compensate for additional material thickness during various repair applications? 

These blocks are great for various repair applications these blocks will compensate for additional 1/4"(6mm) in material thickness.

The Drill Guide Spacer Blocks make it quick and easy to compensate for an additional 1/4" (6mm) in material thickness. Designed for exclusive use with the Kreg Jig® K4, K4MS, and K5. The Kreg Jig® must feature drill guide with spacer slots in the bottom.

Drill Guide Spacer Blocks