Detailed Product Description Laser-welded Diamond Drill Bitfor electrical Switch-box-hole.Thread: M16. Barrel ... Accessory: M16 male converter to Hexagonal or SDS-PLUS pilot drill. Quality grade: Super, Premium, Standard, Economy. Item No ... 5X7mmSDB6868mm424X3.5X7mmSDB8282mm424X3.5X7mmSDB8282mm524X3.5X7mmNOTE: SDB68S24X3.5X7S--laser-welded core Drill Bit for electrical Switch-box-hole, dia 68mm, ...