Steven Graf and Zhach Pham were business partners from a young age. The two best friends met in second grade in their hometown of Westport, Connecticut and ran a lemonade stand, built go-karts and dug for buried treasure — to their parents’ consternation — in the backyard. “We were always making things,” said Pham. Decades later, they had their breakthrough. On an episode that aired Friday, the pair went into CNBC’s Shark Tank and left with a $300,000 investment in their company, Denver-based RigStrips. Steven Graf, left, Zhach Pham at their startup RigStrips on the TV show “Shark Tank” in 2024.