US PRO Industrial 3684 7 Piece 3 8 Inch Drive Extra Long Impact Spline Bit Socket Set

The US PRO Industrial 3684 7 Piece 3 8 Inch Drive Extra Long Impact Spline Bit Socket Set is built for demanding fastening tasks where spline bolts are recessed or difficult to reach. The extra long 110mm design provides improved access over standard bit sockets, making this set especially useful for automotive, drivetrain, suspension, and chassis work.

Each socket combines a CR V chrome vanadium steel body with a hardened S2 steel spline bit, offering excellent resistance to twisting, wear, and impact shock. This construction allows the sockets to withstand repeated use with impact wrenches, ratchets, and breaker bars without compromising strength or precision.

The 3 8 inch drive size is a popular choice for professional technicians, offering a balance of torque capability and access in confined spaces. A phosphate finish helps protect against corrosion while reducing surface wear, extending tool life in workshop environments.

Covering commonly used spline sizes from M5 to M14, this compact but capable set is ideal for European vehicles and machinery where spline fasteners are frequently used. It is a practical and cost effective solution for technicians who need impact rated spline tooling with added reach.

Key Features

• 7 piece impact spline bit socket set

• 3 8 inch drive suitable for impact and hand tools

• Extra long 110mm length for deep and restricted access

• CR V steel socket bodies for strength

• Hardened S2 steel spline bits for durability

• Phosphate finish for corrosion protection

• Ideal for automotive, workshop, and maintenance use

Specifications

• Set type: Impact spline bit socket set

• Drive size: 3 8 inch

• Total pieces: 7

• Bit type: Spline

• Socket material: CR V steel

• Bit material: S2 steel

• Finish: Phosphate

• Length: 110mm

• Sizes included:

  • M5

  • M6

  • M8

  • M9

  • M10

  • M12

  • M14

• Application: Impact and hand tool fastening

• Brand: US PRO Industrial

• Model: 3684