Micro Straight Castro Needle Holder, Diamond Dusted, 18 cm (7") Micro Straight Castro Needle Holder, Diamond Dusted, 18 cm (7") NHDPVN Microsurgical Needle Holders are used to grasp and guide the needle when suturing. Where to Buy x Category Dealer PartnersSales RepresentativeStrategic MarketsSchools RepresentativeAccutron™ Equipment Sales Zip Code Find RepresentativeReset Select a category, input a zip code and click on Find Representative, or explore the complete list here.