Check the listing for details. 5 3/8" Ervin Quick Low Port Curb. Condition: Used. Listed at 100.00 USD. 5 3/8" Ervin Quick Low Port Curb 5 3/8" Ervin Quick Low Port Curb Here is a cool bit! This one is a bit older, with the older style makers mark and bit size mark, meaning this one was likely made by Ervin Quick, before it was transferred to his son Mike Quick. Despite this one being older, its in very good used condition. Alloy mouth, mullen mouth with a lower and wider round port. Mouth is slightly thicker diameter. Port measures 1", 8" shanks. Nice feel to this one. Great, larger and hard to find size at 5 3/8". Is stamped with this measurement. In very good used condition, some natural patina and some scuff marks on the stainless shanks. Nice feel to this one. Additional Information Bars/Gullet Brand Mike Quick Cantle Color Condition Used Discipline Horn Material Model Size Skirt