Set of 6 GCi Stronger by Design G-7 Clamps for truck caps with drill thru mounting holes, such as LEER. Also use for mounting select toolboxes. Made in the USA with 6000 series structural aluminum to ensure quality and strength. Purchase G-31 clamps, search ASIN: B0CJ5RY333, to secure crossbed truck toolboxes. When tightening the bolt, 1 1/4 turn after the bolt is snug should be adequate. Air wrenches are not recommended. If you need a replcement weatherseal for your Toolbox search ASIN: B0BDVSC3D3. To view other high quality clamps for Truck Caps and Toppers: Use G-1 CLAMP (search ASIN: B01LF2ZYXE) to fit CHEVY: Silverado / Sierra 1500, 2500, 3500. Silverado / Sierra '07 with Cargo Rail. DODGE: Dakota. Ram 1500, 2500, 3500. FORD: F150. MITSUBISHI: Raider. NISSAN: Titan. TOYOTA: Tundra. NOTE: Use G-30 CLAMP (search ASIN: B071G8NS3B) to fit CHEVY: Colorado, S-10, Sonoma. FORD: Ranger. GMC: Canyon. NISSAN: Frontier, Frontier '05 and newer w/Cargo Rail. TOYOTA: Tacoma. NOTE: Use G-991 CLAMP (search ASIN: B01MSTGN4K) to fit Ford Super Duty. NOTE: Use G-120 CLAMP (search ASIN: B088W56W47) to fit Toyota Tundra '07 and Newer w/Cargo Rail & Tacoma '05 and Newer w/Cargo Rail, Jeep Gladiator w/Cargo Rail. Made in USA