Felco F15 Compact Bypass Pruning Shears with Revolving Handle Accessories_Power Module while CB-4100 is identified as

while CB-4100 is identified as an optional cutting board

032-inch spring identified by K-Rain as the standard red-spring configuration

Separating valve

but the parts are not all interchangeable

Felco F15 Compact Bypass Pruning Shears with Revolving Handle Accessories_Power Module while CB-4100 is identified asFelco F15 Compact Bypass Pruning Shears with Revolving Handle Brand: Felco SKU: F15 Product Overview The Felco F15 compact bypass pruning shears pair a small high performance cutting head with a revolving handle to help reduce cutting effort. Key Features: Compact bypass pruning shears Revolving handle helps reduce cutting effort Small cutting head for access and precision Forged aluminum handles Sap groove, wire cutting notch, and shock absorbers