The cant hook/peavey is used for rolling logs, some have shorter handles, others longer for rolling larger logs
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And the upgraded timberjack is used for getting them off the ground so you don't cut in the dirt
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The one nice thing about the Stihl peavey is you can buy a timberjack attachment separately and use the tool as you need, either set up as a peavey or timberjack. Cost is about $100 for the peavey and $50 for the timberjack attachment. Both are well made and heavy duty.