Precision-milled ribs assure smooth, positive interlock between two halves with no chance of halves separating or jumping out of grooves. Straight, smooth jaws and self-locking jaw adjustment. Forged, hardened and tempered. Straight jaws and self-locking jaw adjustment.SEPTLS181R210CV. TLS181R210CV. Cooper tools apex Cooper tools apex Straight Jaw Tongue & Groove Pliers - R210CV.