Feature:1. Made of highquality 40Cr steel, and heattreated to improve durability.2. Features high hardness and strength, very wearresistant, dependable to use.3. The clamp can be adjusted by a knob to fit wood boards of different thicknesses.4. Equipped with drill bit and woodworking hole cutter , which can make holes of different sizes.5. This is a practical tool set for furniture factories and woodworking enthusiasts.Specification:Item Type: Drill GuideMaterial: 40 Cr steelColor: BlueOblique Hole Device: Approx. 78 x 50 x 31mm/3.1 x 2 x 1.2inScrew Hole: Approx. 8.5mm/0.3inHolder: Approx. 63 x 50 x 63mm/2.6 x 2 x 2.5inDrill Bit Length: Approx. 170mm/6.7inDiameter of Limit Ring: Approx. 19mm/0.7in.Package List:1 x Punch Locator3 x Drill Bit3 x Limit Rings (10mm, 10mm, 8mm) 1 x Guide Sleeve 10mm4 x Screws1 x Hex Wrench10 x 15MM Eccentric Nuts10 x Embedded Parts10 x Connecting Rods20 x 8MM Round Dowels1 x Wrench