Great product for mounting onto your bow, treestand, branch, or your SRB Fieldrest. The SRB Field Rests Clamp On Phone Holder includes 1 clamp on adapter that mounts on any round or square tubing or pipe structure even a scope on your crossbow or rifle with a diameter of .5″ to 1.5″. The clamp has a 1/4″ screw mount. Also a spring clamp phone holder (adjusts from 2.25″ to 3.25″)and Velcro to hold phone in position for recoil on guns, bows or crossbows. Adjust clamp snug against surface to mount to and snap closed to tighten clamp. Install phone in holder with Velcro if needed. Works awesome on all SRB Field Rests cradles and/or extensions or any where it will clamp onto for hands free operations of your phone in the blind, in the field, in the tree stand or anywhere you need. To adjust position loosen knob above clamp and lean forward or backwards. To swivel simply lift knob and rotate on clamp. Great for small cameras with a 1/4″ screw mount also!