Felco #2 pruners. I bought these 16 years ago when I worked landscaping in college. Comes with it's own servicing tool and you can buy each individual part from the manufacturer, IF
Felco® #200-A Loppers - Organic Growers Supply
Amazon.com: Felco (459067) 200 A Straight Cutting Head Expert Loppers with Aluminum Tubes, 24-In, Silver/red : Everything Else
Loppers Carbon Fiber Handles by Felco – Garden Tool Company
Felco 22-in Carbon Steel Anvil Lopper at Lowes.com
Felco 220 By-Pass Lopper 31.5 in F-220 | The Pruners Warehouse
Felco Model 2 Hand Pruners, 1-inch Cutting Capacity with Felco Shear Case