Friction Grip (FG) 19mm. Shank Type: Friction Grip (FG). Shape: Round/ Pear/ Straight Fissure/Taper Fissure Cross Cut/ Crown Cutter. FG SURG 557. Taper Fissure Head Cross Cut Bur FG (FG 19.0mm). Friction Grip Oral Surgical (Midwest FGOS) FG SURG 25mm.