The Angle Iron Log Guide is designed to firmly hold the guide bar perpendicular to the log for precise, square cuts for log building. The sturdy 4" angle iron frame is held in alignment with strap (included) and ratchet. Four adjustable gripper bolts are placed for more accurate setup on uneven log surfaces. For best results, use a chainsaw bar that is in good shape (a 7/16" hole must be drilled through the bar). Works on logs of any profile from 6-15 inches in diameter. The frame seats on either the rounded portion of the log (Swedish Cope, Full Round, etc.), or the corner (D-Shape, Dovetail, etc.). Made in the USA. Operating Instructions.