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Review of: Bosch CLPK21-120 12-Volt Lithium-Ion Combo Kit

I ordered the Bosch CLPK21-120 12-Volt Lithium-Ion Combo Kit from Amazon. The Kit included a PS40-2A Impact Driver and a PS-20-2a Pocket Driver, two batteries, plus charger and zip-up carrying case.

The product was delivered in about 5 days and the impact Driver drove 2 & ½ inch screws into Oak posts, with minimum effort, that my 18 volt drill failed to drive. The Pocket Driver has an adjustable low torque clutch which makes it easy to drive small delicate screws and bolts.

The Bosch 12 volt battery appears to be identical to the Bosch 10.8 volt battery and has the same identifying number. I successfully charged my 12 volt battery with my son’s 10.8 volt Bosch charger.

The Impact Driver runs fast enough to quickly drill holes, however the impact feature causes the drill bit to stall, therefore it does not drill as well as a conventional drill. The Pocket Driver runs too slow to quickly drill holes if productivity is important.

Both the Impact Driver and Pocket Driver are well built and drive screws and bolts extremely well.

Updated review: Bosch CLPK21-120 12-Volt Lithium-Ion Combo Kit

I am a retired engineer from the National Defense and Telecommunications industry always searching for the perfect tool. I perform a product selection study before every major purchase to identify the best cost item. After evaluating all battery operated impact drivers on the market, The Bosch Impact Driver is probably the best tool in its class.

Since my review of the PS-40-2A Impact Driver I drove more than 50 screws rebuilding a privacy fence and more than 500 screws hanging cement board and drywall while remodeling my master bath. I also performed extensive repairs to my automobiles and lawnmower.

Continuous operation of the Impact Driver drained the battery in about 30 minutes, the same time required to recharge the battery.

I found the PS-20-2A Pocket Driver well suited for rebuilding small engines, installing electrical receptacles and wall switches. The adjustable clutch provides fine control and allows the user to avoid stripping delicate screws and bolts.

I attempted to mix thinset (cement mix for setting ceramic tile) and paint with both the Impact Driver and the Pocket Driver. The Impact Driver was unable to turn the submerged mixing paddle because the impact feature activated allowing the paddle to stall.

The Pocket Driver turned the paddle at full speed; however 400 RPMs was too slow to properly mix thinset or paint.

Conclusion:
The PS-40-2A Impact Driver is the perfect tool for driving screws and bolts. It is fast, powerful, and light. It requires very low pressure to the screw head to drive screws.
The disadvantage: It is ineffective for drilling holes and mixing paint.

The PS-20-2A Pocket Driver drives delicate screws and bolts very well.
The disadvantage: It drills holes and mixes paint too slowly to be efficient.

A variable speed drill is a better choice for drilling and mixing.

Update (2/7/2012): This item is currently on sale here for the lowest price I’ve seen. I also found some auctions for this item here.

The featured review for this product, Bosch CLPK21-120 12-Volt Lithium-Ion Combo Kit Tools & Hardware, was written by O. Wilson.

The average rating for this item is 3.3 out of 5 stars, according to 3 reviews.