Final answer:
This scenario describes a conditional contract in business, where Knockknock agrees to purchase steel only if it is of high-grade type 102 quality.
Step-by-step explanation:
When Knockknock, a manufacturer of stainless steel locks known for their durability, enters into a supply contract that specifies it will purchase steel only if it is of high-grade type 102 quality, this is an instance of a conditional contract.
A conditional contract is one in which an agreement between parties is contingent upon certain, specific conditions being met. In this case, the condition is that the stainless steel supplied must meet a defined grade quality before Knockknock is obligated to follow through with the purchase.