Specification: Package contains 1* hollow drill hole saw Specifications: Material: Carbide Brand new Material: carbide tipped metal Color: as picture shows Connecting Rod size: approx. 300 mm Made of high quality carbide tipped metal material, very durable. SDS plus shank, male thread Adapter Simple operation, easy to use, and fast perforated. Used for drilling walls, stones, bricks,or installation of air-conditioning etc. Package included: 1 x hole saw 1 x 300 mm connecting rod 1 x drill bit High-frequency welding technology inlay alloy Threaded hole: 22mm Uses: Suitable for brick, concrete walls, air conditioning openings Features: ? Use YG8 carbide manufacturing, the matrix 40CR, high-frequency welding technology inlay alloy ? Rounds alloy blade combinations, each blade to bear part of the workload, not prone to chipping off the edge ? High-frequency welding technology, welding openings is very strong, smooth inside and outside welding mouth, precision engage, appearance