Mercer Abrasives 267036-10 Type 27 High Density Flap Discs Premium Zirconia 4-Inch by 5/8-Inch, 36 Grit, 10-PackMercer Abrasives 267036 10 Type 27 High Density Flap Discs Premium Zirconia 4 Inch by 5 8 Inch, 36 Grit, 10 Pack From Mercer Tool Where Quality and Value Come Together. Mercer Tool Corp. was founded in 1968 on Mercer Street in New York City, the brainchild of Mel Wallick who believed industrial markets in North America desperately needed high quality, cost effective products. What began as a small enterprise has expanded into a corporation with a