This handlebar U-bolt mount with 1 inch ball. The 1" ball joint is attached to the aluminum alloy base. TPU over-molded ball head, non-slip and wear-resistant. This 1" ball handlebar mount is secured to the handlebar with a high quality stainless steel U-Bolt. Durable and reliable in the most demanding environments Compatible with RAM & BRCOVAN any B size 1 inch ball double socket arm. Suitable for mounting to round, square and profiled rails and rear-view mirror bars with outside diameters from 0.5'' to 1.25'' Hardware Included: (1) 1/4"-20 U-Bolt for 0.5" - 1" Rails, (1) 1/4"-20 U-Bolt for 1" - 1.25" Rails, (2) 1/4"-20 Lock Nuts, (2) Rubber Caps, (2) U-Bolt Spacers, (4) Stainless Steel Spacers The aluminum alloy U-bolt mount base with 1 inch TPU ball for handlebar rail 0.5''-1.25'' in diamater. Compatible with RAM Mounts B Size 1 inch Ball Double Socket Arm. This 1" ball handlebar mount is secured to the handlebar with a high quality stainless steel U-Bolt. Durable and reliable in the most demanding environments.