Common Questions and Answers | CAMO Fasteners.Why is the Camo Marksman Pro Deck X1 so popular? The Marksman Pro X1 Tool provides a 1/16" gap. It works with the same board sizes as the Pro tool (5-1/4" to 5-3/4" boards). However, the spacer size is smaller when using the Pro X1. Many people prefer less than a 3/16" gap when working with treated lumber or other.