A-One Seimitsu Inc. produces and sells collet chuck products. The company operates in three segments: Collet Chuck Division, Cutting Tool Division, and Automatic Lathe Cam Division. It offers collet chuck/guide bushes used in automatic lathes, general industrial machines, and special machines; re-grinds special cutting tools; cams used in automatic lathes and dedicated machines; and re-polishing and regrinding of cutting tools used in cutting processes. The company was founded in 1965 and is headquartered in Fuchu, Japan.