Compound Gauges 1SET(1*GO+1*NOGO) 3A 0-80~12-32 1l4 5l16 3l8 7I16 1l2 9I16 UN /UNC /UNF /UNS /UNEF Standard Fine Thread Ring Gauge ========== High-concerned chemical : None DIY Supplies : Metalworking Type : Tap Origin : Mainland China