The most common style of residential gutter used today. Two sizes are available 5″ and 6″ K-Style gutter, roll-formed on-site aluminum by Willey’s Seamless Gutters expert installers. Available in a vast array of colors, including copper. One foot of 5″ K-Style gutter holds 1.2 gallons of water. One foot of 6″ K-Style gutter holds 2.0 gallons of water.