An 8 1/4" Lambert rasp – 10mm is a surgical instrument designed for bone reshaping and smoothing. The "8 1/4" refers to the length of the tool, which is 8 1/4 inches, and the "10mm" indicates the width of the blade (10 millimeters). The Lambert rasp is often used in orthopedic or reconstructive surgery, specifically to smooth or contour bones, such as during joint or skeletal procedures.