皿頭 小ねじ - Sara atama ko neji
Standard countersunk heads used for brakes and inside the engine mostly. Again since they are JIS specification the proper screwdriver is highly advised. There are many more length available but I cannot see the utility for bikes, if you need them contact me.
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JIS Screw Countersunk Flat Head
Zinc M6 x 12 is a direct replacement to Kawasaki 221B0612, 221AA0612 on the 900 Z1 to maintain carburetor in place (8 needed).