Professional Tap Wrench Reamer Handle Tool Set 3/16-1/2" (M4-M12) Tap 12-28 PREMIUM Quality tap wrench with 12-28 UNEF tap 12-28 UNEF Tap 1/2" Diameter Fits taps from 3/16" to 1/2" (M4 to M12) Right Handed Thread Visit lethaleye.com for more product information Anti-Slip & Anti-Fatigue handle