Type: Cartridge mounting bolts and nuts; Set Contents: M2.6 bolts, Length: 0.2 inches (6, 8, 12, 15, 18, 20, 25 mm) each; M2.6, 10 x 0.2 inch (4 mm) nuts; Material: Brass, non-magnetic substrate treatment, 24K gold plated finish; Aluminum screws are commonly used for low strength and have many demands for sound quality. BT-2 is a set of brass bolts and nuts that can be used in such situations. The bolts come in a set of 10 with 2 of each of the 7 lengths and a 0.2 inch (4 mm) nut on the opposite side. You can also use these extra long screws to adjust the weight including the headshell and cartridge, combined with the other WA-1 release. For fine tuning, you can adjust the number of nuts and bolt length to make sure the weight of the headshell part is uniform, making it easy to use. The total weight of the cartridge and head shell is uniform, which eliminates the need for needle pressure adjustment when replacing carridges and makes it easier to change cartridges. The nut attached to the BT-2 has a smaller 0.2 inch (4 mm) side and can be used with the groove of the cartridge body. Please refer to the weight of each part listed below as a reference for weight adjustment.