These bar type thumb turns are designed to work with both the 1 star GZT & 3 Star KTP cylinders we stock, the design gives a greater leverage to the cylinder and looks very stylish, manufactured from 316 grade satin stainless steel, these thumb turns are easy to fit, other finished will be available soon, please contact the office for more details. Make sure you select the correct type for the cylinder you have as the connection method is different between the GZT 1 Star Cylinder and the KPT 3 Star Cylinder.