Shimano FH-M5xx / FH-RM30 / FH-F700 / FH-T4000 / FH-QB400 / FH-QC400 / FH-M4050 etc. rear QR skewer, 168mm for 135mm spacing (or 130mm spacing with thick dropouts), Y3BL98010/Y4SK98120. Rear quick release for a lot of different Shimano hubs, Closed length between cam cap and end-nut approx.