ITP Straight Styli - Type A - Silicon Nitride Ball - M3 Thread x 51.5mm Overall Length - TKM3S3004051The ITP Straight Stylus Type A with a silicon nitride ball is a precision probing accessory designed for everyday CMM and metrology work, especially when measuring untreated aluminum. Its lightweight ceramic stem and rigid construction deliver dependable, repeatable contact across routine scans. M3 Thread: Secure, standard mounting compatible with common probe heads and holders. 51. 5 mm Overall Length: Balanced reach that accesses recessed features