4475 Model Code: AA - Price is for 1 Each (part# 4475) This item features: -Locking Type: Ball. -Material: Alloy Steel. -Finish: Chrome Nickel. -Type: Universal Joint Adapter. Len. = Overall Length Len. = Overall Length Model Code Model Description AADrive Size:1/2 in (female square), 1/2 in (male square), Overall Length:2 1/2 in ABDrive Size:1/4 in (female square), 1/4 in (male square), Overall Length:1 5/16 in ACDrive Size:3/4 in (female square), 3/4 in (male square), Overall Length:3 13/16 in ADDrive Size:3/8 in (female square), 3/8 in (male square), Overall Length:2 in