Clockface

What it is

The Clockface uses two arrows, like hands on a clock, to represent your Arm Slot and Spin Direction. This gives the pitcher a graphical overview of the relationship between their throwing mechanics and the spin on the ball. The Clockface shows Arm Slot in yellow and Spin Direction in blue from the pitcher’s point of view.

Why it matters

A pitcher’s body, arm, and hand movement work together to determining how a pitch will behave. The Clockface displays highlight some of the most important relationships in an easy-toread graphical form.

One of the fundamental characteristics of an individual pitcher’s style is their Arm Slot. A consistent Arm Slot is an important starting point for building command and consistency. It’s also important for concealing different pitch types from the batter.

Your Arm Slot has a large impact on how you are able to create spin and movement. For a fastball, Spin Efficiency will generally be highest when the Arm Slot and Spin Direction are closely aligned. For breaking balls, the highest Spin Efficiency is possible when the Spin Direction is about 180 degrees away from the Arm Slot.