Our QUIK-LOK™ Arbor Set provides the fastest hole saw changes and universal fit with all industry standard threaded hole saw sizes, types, and brands. The included adapters ensure compatibility with small-thread and large-thread hole saws and eliminates the need for multiple arbors, saving you time and money. Our QUIK-LOK™ system is designed with the ultimate durability to deliver the strength and reliability to match the all-day demands of the job site. Due to the threaded adapter design, this system retains Hole Enlargement capability. The Reusable Large Thread Pin Adapter is compatible with hole saws from 1-1/4" up to 6-7/8" without the risk of thread stripping, binding or spin-off and retains Hole Enlargement capability. The Small Thread Adapter is intended for hole saws from 9/16" to 1-3/16" with 1/2" x 20 Threads. The Large Thread Adapter is intended for hole saws from 1-1/4" up to 2" with 5/8" x 18 Threads.