ADM Accessories radius blocks for use with dovetails RB-SM-RC6 Small Radius Block Set for RC6. Fits Astro-Tech, Orion, GSO and TSO 6″ f/9 Ritchey-Chretien OTA's. Mounting hardware included. Uses existing mounting holes in OTA. 1.0″ long, 2.5″ wide, .325″ thick, Weight. 2 oz. RB-SM-RC8 Small Radius Block Set for RC8. Fits Astro-Tech, Orion, GSO and TSO 8″ f/9 Ritchey-Chretien OTA's. Curved radius blocks and mounting hardware included. Uses existing mounting holes in OTA. 1″ long, 2.5″ wide, .325″ thick, Weight. 2 oz. RB-SM-C8 Small Radius Block Set for C8. Fits all Celestron 8″ OTA's including CPC and HD models. Curved radius blocks and mounting hardware include. Uses existing mounting holes in OTA. 1″ long, 2.5″ wide, .325″ thick, Weight. 2 oz. RB-SM-C9.25 Small Radius Block Set for C9.25. Fits all Celestron 9.25″ OTA's including CPC and HD models. Curved radius blocks and mounting hardware include. Uses existing mounting holes in OTA. 1″ long, 2.5″ wide, .325″ thick, Weight. 2 oz. RB-SM-C11 Small Radius Block Set for C11. Fits all Celestron 11″ OTA's including CPC and HD models. Curved radius blocks and mounting hardware include. Uses existing mounting holes in OTA. 1″ long, 2.5″ wide, .325″ thick, Weight. 2 oz. RB-SM-C14 Small Radius Block Set for C14Fits all Celestron 14″ OTA's including CPC and HD models. Curved radius blocks and mounting hardware include. Uses existing mounting holes in OTA. 1″ long, 2.5″ wide, .325″ thick, Weight. 2 oz. RB-RC6 Radius Block Set Set for RC6Fits Astro-Tech, Orion, GSO and TSO 6″ f/9 Ritchey-Chretien OTA's. Mounting hardware included. Uses existing mounting holes in OTA. .75″ long, 4″ wide, 1″ thick, Weight. 4 oz. RB-RC8 Radius Block Set Set for RC8Fits Astro-Tech, Orion, GSO and TSO 8″ f/9 Ritchey-Chretien OTA's. Curved radius blocks and mounting hardware included. Uses existing mounting holes in OTA. .75″ long, 4″ wide, 1″ thick, Weight. 4 oz. RB-C8 Radius Block Set Set for C8Fits all Celestron 8″ OTA's including CPC and HD models. Curved radius blocks and mounting hardware include. Uses existing mounting holes in OTA. .75″ long, 4″ wide, 1″ thick, Weight. 4 oz. RB-C9.25 Radius Block Set Set for C9.25Fits all Celestron 9.25″ OTA's including CPC and HD models. Curved radius blocks and mounting hardware include. Uses existing mounting holes in OTA. .75″ long, 4″ wide, 1″ thick, Weight. 4 oz. RB-C11 Radius Block Set Set for C11Fits all Celestron 1.75″ OTA's including CPC and HD models. Curved radius blocks and mounting hardware include. Uses existing mounting holes in OTA. .75″ long, 4″ wide, 1″ thick, Weight. 4 oz. RB-C14 Radius Block Set Set for C14Fits all Celestron 14″ OTA's including CPC and HD models. Curved radius blocks and mounting hardware include. Uses existing mounting holes in OTA. .75″ long, 4″ wide, 1″ thick, Weight. 4 oz. RB-M8 Radius Block Set Set for Meade 8Fits all Meade 8″ OTA's including LX and ACF. Curved radius blocks and mounting hardware include. Uses existing mounting holes in OTA. .7″ long, 5.5″ wide, 1″ thick, Weight. as shown 6 oz. RB-M10 Radius Block Set Set for Meade 10Fits all Meade 10″ OTA's including LX and ACF. Curved radius blocks and mounting hardware include. Uses existing mounting holes in OTA. .7″ long, 5.5″ wide, 1″ thick, Weight. as shown 6 oz. RB-M12 Radius Block Set Set for Meade 12Fits all Meade 12″ OTA's including LX and ACF. Curved radius blocks and mounting hardware include. Uses existing mounting holes in OTA. .7″ long, 7.5″ wide, 1″ thick, Weight. as shown 8 oz. RB-M14 Radius Block Set Set for Meade 14Fits all Meade 14″ OTA's including LX and ACF. Curved radius blocks and mounting hardware include. Uses existing mounting holes in OTA. .7″ long, 8.75″ wide, 1″ thick, Weight. as shown 8 oz.