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 AlloyDrill Bushings Material:Nitride Tool SteelProcess Thickness:10~180mm/0.39~7.09inSide Hole Diameter: 15mmFrontal Hole Diameter:6/8/10mSliding Block Stroking Distance:5~90mm/0.2~3.54inSide Hole Stroke Distance:23~43mm/0.91~1.69inSize:As shown in the picturePackage List:1 x Extended Locator9 x Drill Bushings (3pcs 6mm, 3pcs 8mm, 3pcs 10mm)2 x Knurled Bolts4 x Limit Ring (1pc 6mm, 1pc 8mm, 2pcs 10mm)1 x 15mm Tapper3 x Drill Bits (6mm/8mm/10mm)1 x Hook Spanner1 x Slider Set1 x Main Board(Including 3 Pcs 8mm Drill Bushings)2 x Gasket(0.5mm/1mm)2 x Hex Socket Wrench1 x Users Manual2 x Star Screw Rod1 x Clamping PlateNote: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. .