Measure dimensions needed for your Tonneau Cover before buying. Clamp dimensions: A = 1/4" to 5/8" Jaw Opening, B = 1 1/2". NOTE: For a larger Jaw Opening (Dimension A) of 1/2" to 3/4" search ASIN: B09RTLGVL7. 6 high quality 6000 series structural aluminum clamps for securing inside mount tonneau covers. Shoulder bolt prevents cutting into aluminum. FOR TRUCK CAPS/CAMPER SHELLS/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. JEEP: Gladiator. 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 F Series 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. NOTE: Use G-7 CLAMP for truck caps with drill through mounting holes, such as LEER (search ASIN: B0BXRLX9XP). Made in USA