Spinning Blade is a 
Jakobs Grenade
Spinning Blade is able to be grappled to Catch the rebound to refund a grenade charge.
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How to Unlock the Legendary Spinning Blade Grenade
Legendary Loot
Ordnance
Overview
How to Unlock
Unlock Location:
- Start from the fast travel point in Ruined Sumplands in the Carcadia Burn area.
- You will find a Driller Sight, "Saw's Clench "
- Head inside and at the end you will encounter the Gruntubulous Boss
Farm Method:
- Defeat Gruntubulous.
- Use the Encore Machine nearby to reset the fight.
- Repeatedly defeat Gruntubulous untilSpinning Blade drops.
Amon
Rafa
Vex
Incarnate
Scourge