Snap BMX Products S2 Seat Post Clamp.  Precision CNC machined from USA mill certified 6061-T6 billet aluminum. Stylish design.  Comes with 18-8 stainless steel screw.  Size : 25.4mm (large hole) fits frame post. Small hole fits 22.2mm seat post.  Color - Red Anodized.  Weight - .8 oz.