A selection of dropouts for frame builders. Manufactured in Taiwan by Allotec, a foundry which makes steel frame parts using the lost wax investment casting method. Please see diagram and details spec in the manufacturer's catalog. C05 comes as a setC05H/C05R/C05LW.T:103g C23-2 (Hog's Back dropouts)D: 10mmW.T:336gpost-mountRotor:160mm C25 (pair with C31 or C33) Sliding horizontal dropouts, casting for welding sold separate from hardware100° angle52.9mm slot lengthC31: I.S. brake mountC33: No brake mount C15AXB:11X12.5MMANGLE:55°/62°/66°/70°W.T:180g C17AXB:13X14MMANGLE:45°/55°/62°/66°/70°/74°W.T:171g C47-1D:10MMW.T: 112g C18 (Le Montréal dropouts)D: 10mm55°Right side derailer mountM3X0.5 threading for adjuster screws (not included)Socket 13.2x10.5mm