RAM® Quick-Grip™ XL Phone Mount with Handlebar U-Bolt Base Features: Spring-loaded holder features adjustable side supports that provide a secure fit for a variety of phones and other devices; easily insert and remove your phone with one hand Includes U-bolt base that accommodates rails from .5" to 1.25" in diameter and a short length, B size RAM® double socket arm; ball and socket technology allows for near-infinite adjustability Made of powder-coated, marine-grade aluminum and high-strength composite for durability and reliability in the most demanding environments Backed by a lifetime warranty Specifications: HARDWARE INCLUDED Assembly Hardware (1) 1/4"-20 U-Bolt for .5" - 1" Rails (1) 1/4"-20 U-Bolt for 1" - 1.25" Rails (2) 1/4"-20 Nylock Nuts (2) Rubber Caps (1) U-Bolt Spacer HOLDER DIMENSIONS Height Range: 5.75" - 7.25" Width Range: 2.625" - 3.625" Max Depth: .72" CLAMP RANGE .5" - 1.25" diameter SOCKET-TO-SOCKET LENGTH 3" BALL/SOCKET SIZE B Size (1") WEIGHT CAPACITY Standard Use: 2 lbs Heavy-Duty Use: 1 lb MATERIALS Marine-grade aluminum High strength composite PACKAGING TYPE Poly Bag WEIGHT 0.91 lbs. ADDITIONAL INFORMATION Exposure to vibrations, like those generated by high-powered motorcycle engines, might impact iPhone cameras.