Shop › GROVTEC THRD PRTCTR 1/2-28 X.625 GROVTEC THRD PRTCTR 1/2-28 X.625 $12.56 GrovTec GTHM246, Thread Protector, Black Oxide Finish, Black, 1/2X28" Threaded, .625" Diameter, Fits Pencil Barrels GTHM246 Quantity: Add To Cart Added! GrovTec GTHM246, Thread Protector, Black Oxide Finish, Black, 1/2X28" Threaded, .625" Diameter, Fits Pencil Barrels GTHM246