Surface Drive on open end for better fastener grippingExpands and compliments the 9701 Gearwrench flex head ratcheting wrench setAdds more storage to include smaller size setCompleter set for 9701 GearWrench Flex head ratcheting wrench set includes 13/16", 7/8", 15/16", and 1" sizes in a 13 pc rack. 13 piece rack - extra storage for existing 5/16" - 3/4" GearWrench Flex Head Ratcheting Wrenches. Adjustable set screw - sets desired head tension. Surface Drive on open end - eliminates fastener rounding. Serrated beam works as directional assistant.