The Ametek 33400-13 is a replacement brush for vacuum motors. Used to replace motor brushes when their length drops below 3/16 of an inch. Compatible with motor model 116299-00, 116520-50, 117395-37, 116309-00, 116309-01, 116309-72, 116455-50, 116881-50, and 116881-70. A genuine OEM Ametek part. Ensures a proper fit and functionality.