14 X 3/4 HYDROBAT( 10 pin out)NOTE: 12% Double Box Packing fee is added to all Hydrobat orders shipping UPS. Does not apply to in store pickup.20 and 24 Hydrobats cannot ship UPS : those two sizes are available for in-store pickup and freight deliveries only10 times stronger than pottery plaster bats!The Hydro-Bat is made of Hydro-Stone, a USG product containing cement and crystalline silica, that is 8 to 10 times stronger then pottery plaster. The surface is scratch resistant yet absorbs water like plaster eliminating the need to cut your pieces off the bat with a wire.The Hydro-Bat was designed to fit on wheel heads that have bat pins spaced 10 inches apart on center. The hard rubber grommets cast into the underside of each Hydro-Bat will not swell or change shape and are sized to fit over a 3/8 diameter bat pin head. Due to their smaller diameter, the grommets under the 8.5 and 10 Hydro-Bats are spaced 6 apart and require the HBA Adapter to convert standard 10 inch pins to 6 inches. This adapter is made of sturdy polyethelene plastic and fits snuggly over the 10 bat pins on your wheel head. It has two upfacing 3/8 diameter bat pins fused in at 6 apart. The 8.5& 10 Hydro-Bats fit onto these pins. Similarly, the6 Mini Hydro-Bat has grommets spaced 4 apart and requires theHB6A Adapter to convert the standard 10 pins to 4. (If desired, these adapters can be used as templates to permanently drill 4 or 6 holes into. If you have a wheel head with pins positioned at 9 apart we make Adapter HB9A which will allow you to use our bats. If you dont have bat pins in your wheel, no problem, our product works great with a bat gripper or grabber which allows you to attach any kind of bat to a wheel head. Custom adapters can be made for any size wheel head or pin configuration.