Our largest and most powerful black anodized heatsink is 8.8" long x 2.4" wide x 2.3" tall and has a 0.28" thick base. This massive heatsink can cool all types of semiconductors. We use it with Peltiers and it's amazing! Has various holes drilled and mostly tapped for 4-40 bolts, however it has 5 holes that are not - and are larger. Weights in a 1.15 pounds. This heatsink is massive and 14 fins can really cool.