Godhand Drill BladeExcellent straight line performance! Non slip blade type drill! Easily drills straight holes, even on curved surfaces, without slipping or shifting from the target point. Use a spin blade of the same diameter to smooth the bottom surface and add details with store bought parts! With the drill blades, you can easily create detailed parts in places that were previously hard to drill. Set of 4: 1. 0 mm, 1. 5 mm, 2. 0 mm, 2. 5 mm Shaft thickness: 3 mm