For the JoPo Twist interchangeable thumb system. The thread-like feature absorbs the load of the weight and the velocity of the bowling ball delivery; i.e. visualize pulling a nut straight off a bolt without unscrewing it. The Twist cannot be removed from the bowling ball without the inner being rotated 360º. Does not include outer sleeve or slug.
Easy to install and superior quality compared to other systems
Length: 2 3/4.
*Requires a JoPo Twist Outer Sleeve