1.Diamond core drill bit 2.Drills perfect holes in block, brick, ... per ctnDelivery Detail:5--7days after confirm the orderSpecifications:Diamond core drill bit(core drill bit, drill bit, core bit):Drills perfect holes in block, brick, concrete and ... ordering.Segment on the core bits can be crown or split segment (normal type, turbo type, roof type) Diamond core drill bit(core drill bit, drill bits)