5/16" Barrel Lap, Acro Mfg# 5-16-TH - BL-007 by Penn Tool Co.

Acro Laps ensure swift, precise lapping/polishing/deburring in through-hole applications, from 1/8" to 1-1/2" (3mm to 25mm) diameters. Easily expand up to 15% by turning the adjustment screw. Blind Hole Laps accurately lap 'closed end' holes, 1/8" to 1-1/4" diameters, at high speeds without galling or seizing. The laps reach the hole's bottom, adjusted with a hex key.

• Efficient Lapping: Acro laps ensure swift and precise lapping of holes ranging from 1/8" to 1-1/2" in diameter
• Adjustable Expansion: Milled eccentric slots in the brass barrel allow for instant and accurate expansion of up to 15% or more by simply turning the adjusting screw
• No Setup Required: No set-up time or special equipment is needed
• Stock Replacements: Replacement parts, including arbors, brass barrels, and adjusting screws, are readily available