Discs for measuring is a set of discs with 1 disc of each size to help you decide on the disc size you want.
Joint Kits provide everything you need for 5 joints.
Large JointsThe 1/4" joints use bolts or set screws.
Medium Joints The 1/8" joints use either 3/32" cotter pins, 1/8" bolts or 1/8" set screws.
Small Joints The 1/16" joints are used mainly for small bears and can use only 1/16" cotter pins.