Precisions crafted for durability and reliability in harsh conditions, this clamp includes a 3 / 8 female screw hole to attach additional photography mounts, expanding its functionality beyond standard phone holders Featuring rubber coated ball heads with excellent anti slip properties, the rubber pad provide firm gripping power while protecting mounted surfaces from scratches during use on bicycles or motorcycles Perfect for 1inch ball head arms, this mount works with sports cameras, phone / tablet holders, digital cameras, monopods and motorcycle accessories making it ideal for all 25mm ball head arm setups Designed for quick clamping on circular, square or irregular rails / tube ( 15-55mm diameter), this 25mm ball head clamp easy setup but is not suitable for 17mm mounts due to size specifications This 25mm soft ball metal clamp features a 90mm length, suitable for any device using 1 inch rotating ball head mounting systems The aluminum base and rubber ball head ensures durability and flexibility for various applications, Manufacturer: RUINBNC