Features: *Made of high quality carbide tipped metal material, very durable. *Simple operation, easy to use and fast perforated. *With a hole saw (not included), it can be used for drilling walls, stones, bricks,or installation of air-conditioning etc. *High-frequency welding technology, welding openings is very strong, smooth inside and outside welding mouth. Specification: Product Name: Wall Hole Saw Connecting Rod Material: 45 Steel, Carbide Color: Silver Length: (Approx. ) 320mm/12.5' Optional Stype: 17mm Hex Shank, 12mm SDS-Max Shank Suitable for: Wall Hole Saw Function: drilling walls, stones, bricks,or installation of air-conditioning etc. Quantity: 1Set Package Included: 1 Connecting Rod 1 Center Drill Bit(Wall Hole Saw Not Include) 1 Screw Note: 1.Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data.