1、Made of high quality carbide tipped metal material, very durable 2、High-frequency welding technology, welding openings is very strong, smooth inside and outside welding mouth, precision engage 3、Simple operation, easy to use, and fast perforated 4、Used for drilling walls, stones, bricks, or installation of air-conditioning etc 5、Rounds alloy blade combinations, each blade to bear part of the workload, not prone to chipping off the edge Features: Made of high quality carbide tipped metal material, very durable. High-frequency welding technology, welding openings is very strong, smooth inside and outside welding mouth, precision engage. Simple operation, easy to use, and fast perforated. Used for drilling walls, stones, bricks, or installation of air-conditioning etc. Rounds alloy blade combinations, each blade to bear part of the workload, not prone to chipping off the edge. Specification: Materials: carbide tipped metal Color: as shown in the picture Size: Wall Hole Saw: 50mm/1.96inch Connecting Rod: 200mm/7.87inch Drill Bit: 110mm/4.33inch Package Included: 1 x Wall Hole Saw 1 x Connecting Rod 1 x Drill Bit 1 x Wrench Note: please allow 1-5mm manual measurement error, color may be a little different for different monitor.