Hole Saw Blades (The Saws): This will be the bulk of the 16 pieces, often 12 different sizes ranging from small (e.g., $19\text{mm}$ or $3/4\text{”}$) up to large (e.g., $127\text{mm}$ or $5\text{”}$). Arbors/Mandrels (The Holders): Usually 2 pieces. These connect the hole saw blades to your drill and hold the pilot bit. Different sizes (like $3/8\text{”}$ and $7/16\text{”}$ shanks) are included to accommodate the range of saw sizes. Pilot Drill Bits: A few spare pilot bits (often 1-2 pieces) are included. This is the central drill bit that guides the saw and starts the hole. Accessory Tools: Typically a drive plate and a hex key/Allen wrench (1-2 pieces) to secure the blades onto the arbor. Hole saw set
