3/8" Barrel Lap, Model 3-8-TH by Penn Tool Co.

Acro Barrel Lap for High-Speed Lapping/Polishing/Deburring - Model 3-8-TH. Barrel Laps: Acrolap Barrel Laps ensure swift, precise lapping of long or short through holes, ranging from 1/8" to 1-1/2" (3mm to 25mm) in diameter. Blind Hole Laps: Designed for 'closed end' holes from 1/8" to 1-1/4" in diameter, these laps allow high-speed lapping without galling or seizing, lapping holes precisely from top to bottom. A recessed adjustment screw at the cylinder's end enables the lap to reach the hole's bottom, adjusted using a hex key.

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