Case Construction 48054136 is a counterclockwise-rotation disc mower knife blade with a 14-degree twist, measuring 110 millimetres long by 50.8 millimetres wide. It is the left-hand counterpart to 48054133 and mounts on the opposing disc positions of Case Construction rotary disc mowers.

The 14-degree twist angle drives the cut crop upward and into the conditioner for smooth crop flow. The milled cutting edge delivers a sharper initial edge and greater durability than a rolled alternative. Installing the wrong rotation blade on a disc position causes poor crop lift, increased blade wear, and uneven cut quality across the cutter bar.