Microsurgical Curved Castro Needle Holder, Diamond Dusted, 18 cm (7") Microsurgical Curved Castro Needle Holder, Diamond Dusted, 18 cm (7") NHDCPV Fine-tipped Microsurgical Needle Holders are used to grasp and guide the needle when suturing. Recommended suture sizes: 6-0, 7-0, 8-0. Where to Buy x Category - Any - Dealer Partners Sales Representative Strategic Markets Schools Representative Accutronâ„¢ Equipment Sales Zip Code Find Representative Reset No results found. Please try a different search or explore: Sales Representatives | Dealer Partners | Strategic Markets | Schools | Accutron