1.body:combined,separated 2.full length:107mm,135mm 3.pilot drill:6 4.effective length:35mm,60mm Installed in ordinary electric drill, masonry drill, or bench drill with a stainless steel, cast iron, alloy, all kinds of wood, plywood, gypsum board, fiber products and other materials the best drilling equipment.application: Suitable for softwood, plywood, gas concrete, hardwood, plastic, laminated ...