Ronnie McKenzie (plaintiff) used a ratchet wrench manufactured by S K Hand Tool Corporation (SKHT) (defendant) to loosen an engine bolt. While McKenzie was using the wrench, the wrench came apart, causing McKenzie to fall on the concrete floor and injure himself. McKenzie brought a manufacturing-defect claim against SKHT, arguing that SKHT was strictly liable for the injuries caused by the defective wrench. At trial, McKenzie offered expert-witness testimony that the wrench did not meet design specifications and was thus unreasonably dangerous. However, the trial court refused to submit the evidence to the jury. McKenzie also offered testimony from coworkers that the wrench had never been taken apart after purchase. The jury returned a verdict for SKHT. McKenzie appealed, arguing that the evidence of the wrench’s design specifications should have been admitted.