Description: This self centering doweling jig made of premium tool steel, the drill bushings are of good strength and long durability. The clamp board can hold the wood plate tightly. Come with 6/8/10mm drill bushings and twist drill to accurately drill corresponding size of holes. Adjustable drill guide, easy to meet your drill requirements. Specification: Drill Guide Material: 6061 Aluminum Alloy Drill Bushing Material: Nitride Tool Steel Drill Thickness: 10-180mm Side Hole Diameter: 15mm Direct Hole Diameter: 6/8/10mm Slide Stroke: 5-90mm Side Hole Stroke: 23-43mm Size: Shown as picture Weight: Approx. 1550g/54.7oz Package list: 1 × Extension Locator 9 × Drill Bushings (3pcs 6mm, 3pcs 8mm, 3pcs 10mm) 2 × Knurled Bolts 4 × Limit Ring (1pc 6mm, 1pc 8mm, 2pcs 10mm) 2 × Star Screws 1 × 15mm Tapper 3 × Drill Bits 6/8/10mm 1 × Hook Spanner 1 × Clamp Board 1 × Slider Set 1 × Main Board 2 × Washers 0.5/1mm 1 × Hex Wrench 1 × User Manual Note: Since the slider slides 2mm each time, it can only be aligned with the center of the plate of 10, 14, 18, 22mm, etc. If the thickness of your plate is not these thicknesses, it can't be aligned with the center to punch hole without adding washer.