Simpson 1/2" x 2-1/4" Rod-Coupler Head Sleeve-All Anchor SL50214CThe Simpson Strong Tie Sleeve All expanding anchors are pre assembled, expanding sleeve anchors for use in all types of solid base materials. This anchor is available in acorn, hex, rod coupler or flat head style for a wide range of applications. Model No. SL50214C Head Type. Rod Coupler Head Coating Material. Zinc Plated Carbon Steel Size (in.) 1 2 x 2 1 4 Bolt Dia. (in.) For 1 2 rod Drill Bit Dia. (in.) 1 2 Wrench Size (in.) 5 8 TPI. 16 Max. Fixture