Blind Hole Lap 5/8" by Penn Tool Co.

Acro Lap for Swift Lapping/Polishing/Deburring - 5-8-BH. Blind Hole Laps: Engineered for precise lapping of 'closed end' holes, ranging from 1/8" to 1-1/4" in diameter. Like the Barrel Lap, these laps allow high-speed lapping without galling or seizing. They lap holes precisely from top to bottom. A recessed adjustment screw at the cylinder's end enables the lap to reach the hole's very bottom, adjusted using a hex key.

• Efficient Lapping: Acro laps ensure swift, precise lapping of holes of varying lengths and diameters, ranging from 1/8" to 1-1/2"
• Adjustable Expansion: Instantly and accurately adjust the lap's size up to 15 or more with milled eccentric slots in the brass barrel by simply 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