Coltene - Brinker Clamps (Tissue Retractors) Universal Clamp Set (one of each B-1, B-2Designed to retract the gingiva Avoids cutting the gums For endodontic and operative procedures on molars Built with durable construction Hygenic Brinker Clamp is a specially engineered instrument that is used in the retraction of the gingival tissue around the tooth without lacerating it. Available in different sizes for molars. Each Universal Clamp Set includes # B1, # B2, # B3, # B4, # B5, and # B6 wingless clamp sizes.