Thunderbolt / Hex concrete bolt that is Super Heavy Duty Concrete Bolt With Hexagonal Head is designed for securely anchoring into masonry. It uses thunderbolts for masonry ankerbolts and a strong masonry bolt, equipped with 1000 hours of salt spray resistance tested for durability. Available in M6, M8, M10, and M12 sizes. Screw bolt anchor for masonry bolt [SIZE] The Size Of The Bolt Is Based On The Hole Size You Want To Drill. For Example (If You Have A 8mm Hole Please Order M8 Bolts) [TESTED] 1000 Hours Salt Spray Tested For Anti Corrosion [ANTI SPLIT] Pan Head M6-M8 For Anti Split Technology [EASY DRIVING] Hex Head M10/M12 Allowing The Same Great Technology [SELF DRILLING] 2mm Self Pull Through Thread Design For Ease Of Use (Lightning-Bolt, Thunderbolt, Ankerbolt) **BULK DISCOUNT AVAILABLE MESSAGE US ON LIVE CHAT FOR A QUOTE**