Simpson CPT88Z Concealed Post Tie For 8x8 Posts Zmax Finish 15 Degree Plastic Coil Fencing Siding Nails while lengths up to 1" while lengths up to 1" are fully threaded and longer sizes feature partial threading for greater pull through strength Simpson pin drive expansion anchors are coated in yellow zinc dichromate and used for medium and heavy duty fastening applications into concrete and grout filled block The Simpson CPT88Z Concealed Post Tie For 8x8 Posts Zmax Finish is designed to securely attach wood posts to existing concrete in a clean This product is intended for use with 8x8 lumber but is also available in other sizes