Check the listing for details. P-Tech CNC Clamps ( Large Set ) for Threaded Inserts or Table. Condition: New. Listed at 29.50 USD. P-Tech CNC Clamps ( Large Set ) for Threaded Inserts or Threaded Table. These are for 1/4"-20 tables. This is a new improved wider design for stronger work holding, while still having the HDPE material in case you mill into your clamps by accident. All bolts are Stainless steel for smooth repeated use. These clamps are great for wood, aluminum, and many other materials. Because of the low cost you can use more clamps to keep thin materials flat and secure to the table. with your own hardware you can also use these clamps with 1/4" or 5-6mm T-Track tables. This set comes with the following clamps and hardware. (NOTE: These clamps have a tapped hole for the 1/4-20 screws, but anything from 1/4" to 6mm bolts can be used in the slot design.) Works for CNC, Milling, Shapeoko, XCarve, Onefinity, CarveKing or any T-Track woodworking benches. 8 x 3" clamps, 2 x 4" clamps, 10 x 1" SS bolts, 10 x 1.5" SS bolts, 10 x 2" SS bolts, 10 x SS washers.