I recently came across this clay sculpting tool, actually a set of tools at a discount store in Worcester. The set is by the manufacturer Studio and was bought for £2.00.
The smaller of the two handles has a metal probe, while the larger handle has a magnet built into the shaft. These five sculpting tools can be slotted into the handle and held in place by the magnet. From left to right there is a larger metal probe, a blade, a metal 'ball topped' tool and two black plastic sculpting tools.
The set looks to be well made and very good value, I will give a more detailed report once I have had the chance to use it.