3 Review(s)

Wide range of uses, hole diameter size can be adjustable. Alloy blades, cutting smooth, the hole wall are smooth and no glitches, good effect of thestraight roundness, opening hole depth is 30mm.How to use:1. Two blades reach drill center distance are equal, can open hole.2. Two blades reach drill center distance are not equal, can get concentric rings and circles.3. Before drilling to check whether the blade is fixed and adjustable diameter bolts tightened to prevent accidents4. When the blade is not sharp please grind the blade then use.