Problem Solvers Headset Stack Spacer - 25. 4mm (1")Dial In Your Stack Height Available in the most common sizes and thicknesses, Problem Solvers headset spacers help riders get their stack height just right. Made from aluminum with an anodized or polished finish and no visible logos, these spacers are the clean, simple solution for fine-tuning cockpit height on 1" steerer tube setups. Features Anodized aluminum constructionfor low weight and maximum durability Clean, logo-free designfor a discreet finish on any build Fits 25. 4mm (1") stem clamp diameters Available individually or as a kitcovering the most common stack-height adjustments SPECIFICATIONSIntended Use Headset Stack Height Adjustment S. H. I. S. Stem Clamp Diameter25. 4mm (1")Material Aluminum, anodized or polished, no logos Available Thicknesses3mm, 5mm, 10mm (sold in bags of 10); 15mm, 20mm (sold individually) | Problem Solvers | Headset Stack Spacer - 25. 4Mm (1") | Silver | 10 Pack