Neewer 4-hole Rod Raiser Clamp to Raise a Second Set of 15mm Rods on DSLR Shoulder Rig This 4-hole 15mm rod raiser clamp is widely used on standard 15mm DSLR/DV support rig system to attach other bracket or device for convenient shoot and recording. It allows front-of-camera accessories (such as a follow focus or matte box) to be used with video DSLR with battery grip or other under-camera accessory. It raises a second set of 15mm rods 30mm from the existing rods. Fits standard 15mm rods, 60mm rails center-to-center distance. Made of Aluminum alloy, very solid and durable.