Topline C7303 7-Spline Truck Wheel Lug Nut Key 13/16" & 7/8" Hex Drive

The Topline C7303 is a large 7-spline lug nut key (socket adapter) designed for installing and removing spline drive lug nuts on trucks and SUVs. This heavy-duty key bridges the gap between a standard socket wrench and spline-pattern aftermarket lug nuts, making wheel changes straightforward without the need for specialty tools.

Key Features:

• 7-Spline drive design — engineered specifically for large-diameter truck spline lug nuts
• Dual hex compatibility — fits both 13/16" (21mm) and 7/8" (22mm) hex socket drives
• Inner diameter approximately 0.91" — sized for larger truck and SUV lug nut profiles
• Overall length approximately 3.5" — provides adequate clearance for most wheel and hub configurations
• Thread compatibility — works with 1/2"-20, 12mm x 1.25, and 12mm x 1.5 spline lug nuts
• Note: Impact wrench use is not recommended — hand torque only to avoid undue stress on the key

The C7303 is the large-format version in the Topline spline key lineup, intended for full-size trucks and SUVs running spline drive aftermarket wheels. Always torque lug nuts to the vehicle manufacturer's specification using a calibrated torque wrench.