1,Made of 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 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 or 1.96inch Connecting Rod: 200mm or 7.87inch Drill Bit: 110mm or 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.