Weight: Approximately 44g (actual measurement, may vary) Materials: Resin, Stainless Steel Color: Black Contents: Reinforced nylon bracket x 1 Dedicated M5 stem bolts x 2 M5 cap bolts x 3 Washers x 4 Light hanger x 1 Bryton mount base x 1 M3 cap bolts for mounting base x 2 Hex wrench included This is a mounting system for sports bikes like road bikes, installed by replacing the stem fixing bolts with the included dedicated M5 stem bolts. Due to the structure of these dedicated bolts, the stem and bracket are fixed separately, allowing for individual torque management. A mount base for a cycle computer can be installed on the upper part of the bracket. A light hanger compatible with tripod mounting stays for GoPro etc. can be installed on the lower part. [Important: The upper and lower parts are fixed with common bolts, sandwiching the bracket. Due to the structure, the orientation of the mount base and light hanger cannot be changed individually. Please check the socket direction of your cycle computer before purchasing.] Shipped via anonymous delivery. If you purchase this item with other items that can be shipped together, we will discount the shipping cost.