Genmitsu 4 Pack Hold Down Clamp Kit, Cnc Router Clamp For Woodworking And Product Details Feature: This clamp can be used on a T-Slot Aluminum Spoilboard, and also can be used on Threaded MDF Spoilboard with pre-installed threaded holes (4mm (0.16'')) . Compatible with Genmitsu PROVerXL 4030 CNC router kit, 3040 Extension Spoilboard, as well as other large CNC machines. Just make sure the size of T-Slots/ holes on your Spoilboard can be compatible with this clamp. Dimensions: This clamp is 85mm length x 20mm width x 68mm height. (3.35'' x 0.79'' x 2.68''). Working range: This clamp accommodates material up to 35mm (1.38'') thick and holds it firmly in position. It can hold a variety of materials for desktop CNC router machines. Sturdy Quality: Constructed of High Strength Cold Rolled Sheet for durability and wear resistance. Versatility: This clamp provides exceptional clamping forces for your universal t-track system configurations and assemblies. It is ideal for work holding, positioning, and fixturing for woodworking or metalworking, including routers, drill presses, CNC, table saws, jigs, panels, vertical mills, and more. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.