The 12" Mitchell Camera Riser from Proaim is solidly built using machined commercial grade aluminum. It adds 12" of height to your Mitchell Mount and will support up to 392 lb. The dual locking mechanism consists of features a shaft with extendable pins that fit through a standard Mitchell mount/plate. Once the riser is on the Mitchell plat, rotating the shaft extends the pins and the locking knob under the riser tightens the mount onto your plate. A locking lever on the top of the riser's base provides you with additional leverage to tighten the riser even more.