Two - 1 1/8 Pistons. Comes in 2 halves, which are then both mounted to a caliper bracket or brackets through the 2 bolt holes.
The bolt hole spacing is 1.875" center-to-center and they fit 5/16" bolts. Dot 5 brake fluid is recommended. These calipers are commonly used on Micro Sprints, Mini-Sprints, Racing Go Karts, Recreational Go Karts, Quarter Midgets, Mini-Cup cars, Jr. Dragsters, Racing Lawn Mowers, Racing Barstools, and hundreds of motorsports applications.We also have thousands of other High Performance Parts in our store. We want you to have the parts as bad as you do. The item "MCP ENGINETICS KARTING BRAKE CALIPER, BRIGGS, BILLET, 5/8 BORE, GO KART, 1/8 ROTOR" is in sale since Friday, September 5, 2014. This item is in the category "eBay Motors\Parts & Accessories\Performance & Racing Parts\Auto Performance Parts\Chassis, Suspension & Brakes\Performance Brake Calipers". The seller is "kratter" and is located in High Performance Parts. This item can be shipped to United States, Canada, United Kingdom, Australia, Mexico, Germany, Japan, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Greece, Portugal, Cyprus, Slovenia, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Austria, Bahamas, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Viet nam, Uruguay, Russian federation, Ukraine, Cayman islands.