Reversible for 2X2 or 4 in line. 3/8" size. They fit in a 14mm headstock hole (the most common size). The original owner machined the lollipops down to a paddle shape-now they are more ultralight than ever! Includes all the parts (bushings and washers) and 4 tiny screws. $40 shipped in USA. PM your email and I'll send a Paypal invoice. Check out my stellar TB feedback!