5 Pack of QUIK-LOK™ Arbor Small Thread Adapters are intended to be used with hole saws from 9/16in up to 1-3/16in. The threaded design is a universal fit compatible with all industry standard threaded hole saws from 9/16in up to 1-3/16in. Thread size of 1/2in x 20. These adapters are only for use with the Milwaukee QUIK-LOK™ Hole Saw Arbor System. *Product images are representative only.