The Malco HH4 Quick Change Pilot Drill is constructed from durable High Speed Steel and integrates seamlessly with the HA3 Quick Connect Arbor. Featuring a built-in 10 mm hex shank for secure gripping in a 1/2 in. drill chuck, its 7-3/4 in. (196 mm) overall length allows the tip to extend approximately 1 in. beyond the hole saw teeth for improved performance on lap siding, rim joists, and fiber-cement cladding.