Our Pull-Back Arbor with Retractable Starter Bit for Diamond Max™ Hole Saws uses pins with a pull-back design to prevent binding and provide faster, easier hole saw changes. The Retractable Starter Bit creates a divot in porcelain, tile, or stone to provide accurate centering with no pilot hole drilling required, saving you time and eliminating the risk of damaging your material when drilling a pilot hole. Use with Diamond Max™ Hole Saws to experience the best-in-class performance and lowest cost per cut on the market with up to 20X longer life. Compatible with all Diamond Max™ Hole Saws from 1-1/4” to 4-1/2”.