I received this as a gift, so I don't know the details. Please check the photos. m(_ _)m uxcell Shaft Collar, Black Oxide Plated, Single Split Axle, Clamp-On Collar with Set Screw, 19 mm Bore, 38 mm Outer Diameter, 13 mm Width, Pack of 2 Thank you for viewing! ♡ *Please read the profile before purchasing and understand before making a purchase♡︎ ⭐︎Please check the actual photos for the condition of the product♪ ✳︎The contents have not been tested for operation. ✳︎To offer the product at a lower price, we may ship it without the box or bag due to shipping costs. ✳︎We will be closed for shipping on weekends and holidays. Please be aware if you are in a hurry!!! ⚠︎If there are any problems, please contact us 【before evaluation】 Please note that we do not accept returns or refunds after the transaction is completed!!! #Click here for yun's product list ✨☜ ---------------------------------- Size - The round hole shaft collar has an inner diameter of 19 mm, an outer diameter of 38 mm, and a width (thickness) of 13 mm. The single split design collar fits securely and stably on the shaft, preventing components from slipping or shifting from their position without damaging the shaft. (14-48.) 0021