and : These hole saws are of bi-metal construction with high speed steel saw teeth and special flexible steel saw body for longer life and edges. Made of quality plastic, the guide jig is more solid and for long-term use. Wide Application: This hole saw can also be used extensively for cutting thin metal, wood, plywood, pipe, soft plaster and plastic, enough for the average as well as professional projects. Easy to Use: Step 1 secure the jig with screw, use a 2-1/8-inch hole saw to drill holes on both sides of the door, step 3 use a 1-inch hole saw to drill holes at the latch position, step 4 remove the screws and remove the jig Attention: (1)The hole saw can't drill hole in brittle materials such as glass ceramic concrete, etc. (2)The hole saw should always be perpendicular to the drilling plane during drilling Color: Orange Color Material: Metal Package Contents: 1X Door Lock Installation Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.