Season 12 Episodes13
Cast1

Lynne Adams
Narrator (voice)
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Ranked #13 of 13 in Season 12•−0.5 vs season avg
Hardened steel shafts are shaped and fitted with handles to make screwdrivers, diesel engines and hydraulic systems are assembled into compact track loaders, calibrated weighing mechanisms are installed in physician scales, and composite materials are layered and cured into carbon fibre baseball bats.

Lynne Adams
Narrator (voice)
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"Screwdrivers, Compact Track Loaders, Physician Scales, Carbon Fibre Bats" is episode 11 of How It's Made season 12. It scored 7.0/10 from 20 votes, ranking #13 of 13 episodes this season (season average 7.5). It aired on March 18, 2009.