RAM Medium Tough-Clamp with Double Socket Arm & 1inch Ball with 1-4inch-20 thread stud Mount for Cameras (sku 18486)RAM Medium Tough Clamp with Double Socket Arm & 1" Ball with 1 4" 20 thread stud Mount for Cameras. RAP B 366U RAP B 201U RAP B 397 2U The male 1 4" 20 thread stud will connect to any standard female thread found on camcorders and digital cameras. The Tough Clamp is extremely versatile with endless applications. Clamps to flat surfaces and square rails up to 44. 4mm & round rails from 19mm to 28. 5mm. Swiveling padded jaws for protective, stable and