Kluson's 100% no-mod required locking tuning machine using the original stamped steel housing, mounting screw pattern and push-in bushing. Kluson added its most popular and current double line branding to the back of the housing for easy recognition. This Kluson tuning machine set meets the demands of the modern player with an easy to operate string post locking mechanism making secure string changes faster for the working musician without changing the overall appearance of a vintage styled instrument. String Post Overall length including cap= 1 inch String Thru Hole ctr Height= 23/32 in. Comes with Kluson standard bushings. Uses same footprint as original stamped steel Kluson tuning machines Uses Kluson Bushings MB65N US Outside diameter = 8.85mm Inside diameter = 1/4 inch or 6.48mm