19mm Metal AccuGrind™ Keck Clips are safe, universal clips for ground joints manufactured from high grade stainless steel. Their slim, symmetric design solves application problems of common clips and clamps. They are more secure, have better thermal and chemical resistance and are able to be used with stand clamps vs plastic clips. These will secure conical, spherical, stopcocks and glass stopper ground joints. Far superior fit vs Clipox brand clips and lower cost too! Increases the safety of glass instruments Secure horizontal and vertical in case of pressure overload Easy to mount and to remove due to two-sided handles Longevity of suspension and shape due spring steel wire Outstanding thermal, chemical and acid resistance Reduced scratch of glass surface due to polished surface of material