Heavy Duty 22-inch Gooseneck Flex Arm usable with all 1/4"-20 clamp/mount/grips, 1/4"-20 female to 1/4"-20 male, or 3/8" female to 1/4"-20 male. Use with CVM-10, CVM-12, or CVM-20 or any other compatible products. 3/8" Female to 1/4"-20 male, & 1/4"-20 female to 1/4"-20 male (adapter insert screw).