Features: The positioning extension rod is extended to 600mm, which greatly extends the positioning distance between the two holes. The extension rod is detachable and the long hole positioning is more convenient. Wide range of process thickness from 10~180mm. The stroke length of the sliding block is 5~90mm,enough for many needs. Made of fine aluminum alloy material,durable and has long service life. Specification: Tool Material:Aluminum Alloy Drill Bushings Material:Nitride Tool Steel Process Thickness:10~180mm/0.39~7.09in Side Hole Diameter: 15mm Frontal Hole Diameter:6/8/10m Sliding Block Stroking Distance:5~90mm/0.2~3.54in Side Hole Stroke Distance:23~43mm/0.91~1.69in Size:As shown in the picture Package List: 1 x Extended Locator 9 x Drill Bushings (3pcs 6mm, 3pcs 8mm, 3pcs 10mm) 2 x Knurled Bolts 4 x Limit Ring (1pc 6mm, 1pc 8mm, 2pcs 10mm) 1 x 15mm Tapper 3 x Drill Bits (6mm/8mm/10mm) 1 x Hook Spanner 1 x Slider Set 1 x Main Board(Including 3 Pcs 8mm Drill Bushings) 2 x Gasket(0.5mm/1mm) 2 x Hex Socket Wrench 1 x Users Manual 2 x Star Screw Rod 1 x Clamping Plate Note: 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 not punch the center if completely without the gasket. .