AN256: Fundamentals of Bit Selection and Use
Figure 7. Differing styles of shanks on curb bits. Note that the bottom right bit has shanks that rotate independently but have a controlled range of motion due to a built-in stop.
Figure 7. Differing styles of shanks on curb bits. Note that the bottom right bit has shanks that rotate independently but have a controlled range of motion due to a built-in stop.
