104bcd conversion base adopts aluminum alloy CNC cutting to ensure the accuracy of product use.104bcd conversion base is perfectly compatible with Electric bicycle Mid Drive Motor, 36V/48V 250W 350W 450W 500W 750W motor104bcd conversion base material is aluminum alloy material, hardness is much higher than the original steel chain wheel, strong and durable!104bcd conversion base can be used with many accessories for mountain bikes and can be combined with a variety of configuration options, suitable for XC AM DH multiple routes, city commuting104 BCD Spider for Bafang Mid Drive4 Chain Ring BoltsWeight:104BCD Conversion Base 42g34T chain wheel 47gApplicable modified mountain bike 26/27.5/29er 20 inch folding bike 700C road travel bikecolour:blackMaterial:Aluminum alloysize:Thickness:4mmPackage Contents:1 * adapter plateOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.