Pedros Pro Spoke Wrench 3.30mm. The Pro Spoke Wrench takes ergonomics and versatility to the next level. The dual-sided design with both 3-side and 4-side openings features a reversible handle. When using either wrench opening the curved and sculpted plastic handle fits perfectly in your fingers and positions them on either side of the spoke for ideal leverage and control. The wrench is investment cast heat-treated steel ready for years of service and the precision-cut openings are perfectly sized for fit and speed.