Promax Bike 31.8mm Lightweight Alloy Black  Seat Clamp For 27.2 Post 20 grams

• 31.8mm alloy seat-tube clamp with Promax logo on
• These are for frame seat-tubes where your saddle post is 27.2mm or similar usually. (your seat/saddle post size is usually marked below the limit mark) 
• 14mm depth single bolt clamp
• Colour: Black
• Secures with M4 bolt (4mm allen key head)
• Lightweight at 20g