This is a CNC machined .630 Inside Diameter Group 27 light can, second generation. The can is turned on a CNC lathe to create the basic configuration. The detailed machining is done by CNC milling and drilling. It is OD ground to reduce un-necessary weight. The can is then case hardened and lastly nickel plated. The plating aids greatly during soldering however we recommend roughing or abrading the Inside Diameter prior to applying the adhesive for the magnets. The can accommodates standard G27 light magnets from a variety of suppliers including those listed here on this site, DMW0094. It is designed to fit up the the DMW0091 and DMW0095 .610 end bells as well as with Koford and Cahozha G27 / G27 light .610 end bells. The finished weight of this can is 1.3 Grams. Please note that this along with the mating end bell makes for a very tight package for an .850 arm. It may be necessary to depress the bearing in the can by about 0.008" and of course ensure there is a good bead around the bearing after installation.