Draper 1x Expert 7/16" Hexagonal Holesaw Arbor with HSS Pilot Drill for Holesaws. This arbor is designed for use with holesaws ranging from 32mm to 210mm in diameter. It features a 7/16" hexagonal shank with a quick-release and lock mechanism for secure and easy bit changes. The arbor is supplied with a 1/4" HSS pilot drill. Compatible with Draper brand tools.