Corner Block, Single is a 90 degree model featuring one row of aluminum rollers. Corner blocks evenly distribute pressure on coax or fiber cable when pulling around corners. Steel side plates with straight base act as a strut for increased strength. Nylon axle bushings provide easy swivel and longer axle life. Adjustable keeper arm holds cable in place as it is pulled through block. Aluminum rollers reduce friction, preventing potential heat build up and damage to synthetic rollers. Corner blocks are used to make cable placement easier.