Elongated by 3mm to access deep periodontal pockets and root surfaces of 5mm or more.Gracey 1/2: Slight contra-angle for anterior incisors and caninesGracey 3/4: Short contra-angle for anterior incisors and caninesGracey 5/6: Medium contra-angle for anterior and premolarsGracey 7/8: Med.-for premolars and molars, facial and lingual surfacesGracey 9/10: Long contra-angle for molars. Shank and blade are at an acute angle for less accessible root surfacesGracey 11/12: Angulated to reach mesial surfaces of all posterior teethGracey 11/14: Mesial/DistalGracey 12/13: Mesial/DistalGracey 13/14: Angulated to reach distal surfaces of all posterior teethGracey 15/16: Same contra-angle bends as 13/14, but blade positioned to reach mesial posterior surfacesGracey 17/18: Accentuated shank angles and multiple bends. Long terminal shank, offset, angled blades, reduced blade length. Satin Steel # 7 Handles are packaged with Black Grips. You can Customize your instruments with the color of your choice by purchasing additional color grips.