Graspers are available in 2.75mm, 3.4mm and 4.2mm shafts. Series 1 NR Graspers are made with non-ratcheting handles and are non-locking. Series 1 SR Graspers features a self-releasing locking mechanism. All WishBone Graspers feature a ratcheting lock mechanism that can be disengaged for non-locking operation.