The Cutter Heads offer outstanding features, including 360-degree handle rotation, 4-sided Cutting Blocks, hand-operated Gauge Blocks, Shock Absorbers, and the lightest weight and smallest size in each of their classifications. The 360-degree rotation feature is simple to operate. Just loosen the _" socket head cap screw at the bottom of the handle plate (#003). Rotate to the desired angle and retighten. The 4-sided Cutting Blocks are secured with _" socket head cap screws. The Cutting Blocks operate under extreme pressure. Therefore, it is very important to check and retighten the Cutting Blocks DAILY. When a block becomes dull or chipped, remove, rotate, and reinstall. Again, secure very tight! Note: We recommend rotating both blocks to new cutting edges at the same time. The Gauge Block is spring loaded and easily rotated by one-hand. Rotate the Gauge Block to match the diameter of the rebar in use. Proper use will minimize shear, produce cleaner cuts and extend the life of the Cutting Blocks. To operate, simply pull out just enough to rotate, rotate, and then return to original location. Be sure the Gauge Block returns flush to the body. Leaving one edge elevated may cause breakage and injury. Note: It may seem easier to leave the Gauge Block wide open. However, you will find yourself replacing more Cutting Blocks, working with sharper and more dangerous rebar edges, and premature failure of the hydraulic cylinder. Shock Absorbers allow short cut rebar to safely drop, rather than dangerously fly away. Alert operation is the key to safely using the Cutter. Always insure that rebar is carefully placed within the bottom of the housing (#002) and run straight across the face of both cutting blocks (#019).