All items are 1/2" (12.7mm) SQ., and all are Ko-ken brand, excluding the bonus rail. I am selling these as I don't use them often. Long Spinner Handle 600mm 4768P-600 Extension Bar 300mm 4760-300 Extension Bar 150mm 4760-150 Extension Bar 75mm 4760-75 12-point Socket 12mm 12-point Socket 14mm 12-point Socket 17mm Universal Joint 4771 All items are one each. The rail is included as a bonus. Thank you for looking. While not completely flawless, I have added photos to make the condition as clear as possible. No additional items have been added.