50 New KWM Grandfather Clock Bushings. This is a new assortment of 50 KWM grandfather clock bushings. These are used on grandfather clocks, industrial movement center wheels, and barrel arbors. You receive five bushings each of ten different sizes, covering pivot sizes 4.75 to 6.65 mm with a height of 3 and 4 mm and an outside diameter of 8.7 mm. These bushings come in a plastic storage box that measures approximately 2 5/8" x 2 3/16" (67 x 56 mm).