Tungsten Carbide Woodworking Hole Saw: The bit set is constructed of titanium steel alloy for long lasting durability. High Speed Steel Forstner Bits Overlapping and Overlapping in All Types of Wood, Easy to Drill Hinge Hole, Cylinder Hole, Computer Desk Thread Hole, Home Cabinet Fastener.5-pack of drill bits in different sizes: includes 15mm, 20mm, 25mm, 30mm, 35mm positioning drill bit. Suitable for a variety of occasions, punching on wood, plywood, wood products and plastics. (Please do not drill metal materials, it is not suitable).X-Wing Design: The X-Wing head can provide visibility and stability during operation. The center curve of each drill bit precisely and prevents walking and wobbling during operation, creates perfectly round and precise holes with the center spur design.Depth stop: a depth stop can be fixed on the shank, which prevents you from drilling too deep, limited depth for 15mm to 45mm. You can also remove the stopper for unlimited depth. Guided by the circular rim, drills all arcs of a circle in any direction, in the design with curve, the head is good for removing debris and working efficiently.Professional and various use : Suitable for drill gun drill, bench drill, vertical drill, manual electric drill, motorized drilling machine and mobile tape magnetic drilling machine. The set can be used for punching wood products, mounted spherical door spike, drawers, plastic products, wood, plywood, etc.Features:Material: tungsten carbide and high speed steelLength: 78 mmEffective depth: 10-40mmHandle length: 27mmNet weight: 484gColor as shownNumber of pieces delivered: 5pcs/set