1、ALUMINUM ALLOY MATERIAL: Made of premium aluminum alloy material, the drilling locator puncher is strong and sturdy, lightweight and corrosion resistant, ensures a long life span. 2、3 DRILL BITS: There are 3 drill bits in the package of different size, 8mm, 10mm, 15mm. You can use them respectively according to your actual needs. 3、CLAMPING RANGE: This doweling jig drill kit has a clamping range up to 40mm. Check the range for better using experience! 4、DRILLING ADJUSTABLE: The adjustable metal bushing is accurately aligned when drilling, and it is easy to adjust the drilling height and drilling depth. 5、IDEAL REPLACEMENT: This dowel drill guide kit is an ideal hole puncher tool replacement for more accurate and efficient hole punching!