8" Economical 1/4"-20 Right-Hand Screwback Master Lap

The 6" and 8" 1/4"-20 Right-Hand and Left-Hand Screwback Master Lap is a versatile lapidary tool designed for precision polishing and grinding of gemstones, glass, ceramics, and stone. Available in both precision and economical options, this master lap fits standard screwback machines, offering cost-effective solutions for hobbyists as well as high-accuracy performance for professional lapidists and  jewelers. Constructed from durable aluminum or composite materials, the lap ensures even, consistent contact with diamond polishing compounds, providing smooth finishes, uniform material removal, and extended lap life. With its 6-inch and8-inch diameter working surfaces and 1/4"-20Right-Hand and Left-Handscrewback mount, it delivers broad, stable coverage for shaping, pre-polishing, and finishing applications. Compatible with diamondcompounds, pastes, and lapping powders, this master lap is ideal for gemstone shaping andpolishing,glass and crystal finishing, ceramic and stonepolishing, and all precision tasks in lapidary and jewelry workshops. Whether performing professional-gradepolishing or hobbyist lapidary work, the 6" and 8" screwback master lap provide reliable, high-quality results across a wide range of materials.