These bases are used to build a High-Rise Clamp by adding any type of clamp-strap assembly. Modular design allows stacking on Narrow Riser Blocks and Spacer Blocks for additional height. Available for 5/16-18, 1/2-13, and 5/8-11 thread sizes. Made in the USA.
A hex-head cap screw is required for mounting (see table below to order).