Upgraded Dry Drilling Design : Diamond Drill Bit integrated with wax lubricant inside which melts while dry drilling and cools the cutting surface; Water can be used as additional cooling to prolong the life of the bit. Surface plating can prevent the drill bit from rusting.

Multiple Size Dry Diamond Core Drill Bit: The diamond drill bit set contains 7 pieces of dry diamond bits different sizes, including 1pc 3/16” (5mm), 1pc 1/4” (6mm), 1pc 5/16” (8mm) , 1pc 3/8” (10mm), 1pc 1/2” (12mm) , 1pc 9/16” (14mm) , 1pc 5/8" (16mm)fit your need.

Widely Compatibility: black diamond drill is designed in round shank, which is compatible with most machines, such as hand drill, angle grinder, bench drill, also can be matched with side flutes help to remove debris and drill holes smooth and fast; Depth mark is also useful for precise project.

Wildly Application: dry diamond drill set can be applied for drilling clean holes to hard materials, which especially fits well for tiles, porcelain ground, granite ceramic glass mirror marble stone masonry brick and so on; Note: not applicable to wood.