Compatible with Trek Marlin 4 2021. It is also suitable for most bicycle types, including mountain bikes, road bikes and folding bikes. Please check compatibility before purchase to ensure your bike fits. Material and construction Made from aluminum alloy with stainless steel screws. Robust and durable; the thickened design increases stability and reduces the risk of breakage. Ideal for everyday commuting and outdoor riding; keeps your bike securely attached. Stability and grip Thickened wear resistant non slip base prevents the bike from slipping on wet surfaces or mud; provides better grip when parking on a slope; helps protect the bike from damage. Height adjustability Adjustable stand height to match wheel diameter and personal preference. Flexible for different bike types and sizes to meet the needs of various cyclists. Use scenarios Parking on a slope during trail stops or city rides; securing the bike on damp or muddy ground at trailheads or public spaces; performing roadside maintenance or quick checks with adjustable height for different wheel sizes.