For sliding door or similar applications, the GM990MKIV is a strong, 8 pin reprogrammable radial pin tumbler pushlock with a simple 'push to lock, key to open' operation. For optimum key control, the customer specifies the number of operator and change keys required, avoiding the risk of surplus keys falling into the wrong hands. This pushlock may share a key combination with other 8 pin Octagon Camatic products, including those in the System 22 range.

The internal parts are made from solid brass for reliability and durability. There is an anti-drill center. The die-cast housing and flange have a chrome plated finish.