Features 1、Made of high‑quality 40Cr steel, and heat‑treated to improve durability. 2、Features high hardness and strength, very wear‑resistant, 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 Guide Material: 40 Cr steel Color: Blue Oblique Hole Device: Approx. 78 x 50 x 31mm/3.1 x 2 x 1.2in Screw Hole: Approx. 8.5mm/0.3in Holder: Approx. 63 x 50 x 63mm/2.6 x 2 x 2.5in Drill Bit Length: Approx. 170mm/6.7in Diameter of Limit Ring: Approx. 19mm/0.7in Package List 1 x Punch Locator 3 x Drill Bit 3 x Limit Rings (10mm, 10mm, 8mm) 1 x Guide Sleeve 10mm 4 x Screws 1 x Hex Wrench 10 x 15MM Eccentric Nuts 10 x Embedded Parts 10 x Connecting Rods 20 x 8MM Round Dowels 1 x Wrench