Grant Prideco S-4/A Registration of securities issued in business combination transactions (amended)

Exhibit 12.1

GRANT PRIDECO, INC.
Computation of Ratio of Earnings to Fixed Charges
(Unaudited)
(in thousands, except ratio amounts)

	December 31,															Nine Months Ended
	2000			2001			2002			2003			2004			September 30, 2005
Earnings (a)	$	(21,879	)	$	40,628		$	24,315		$	12,112		$	101,746		$	178,213
Less:
Undistributed equity earnings (b)		4,939			(3,019	)		(10,746	)		(14,127	)		(6,525	)		21,808
Minority Interest in Pretax Income		422			1,308			4,425			4,190			6,561			9,467
Plus:
Equity loss (b)		—			—			—			—			—			—
Interest Expense		17,005			27,067			27,040			43,871			41,889			24,378
Interest Component of Rent Expense		2,721			2,887			4,207			4,645			4,667			2,949
Adjusted Earnings	$	(7,514	)	$	72,293		$	61,883		$	70,565		$	148,266		$	174,265
Fixed Charges:
Interest expense		17,005			27,067			27,040			43,871			41,889			24,378
Interest capitalized		363			—			—			—			—			—
Interest Component of Rent Expense		2,721			2,887			4,207			4,645			4,667			2,949
Total Fixed Charges	$	20,089		$	29,954		$	31,247		$	48,516		$	46,556		$	27,327
Ratio of Earnings to Fixed Charges (c)		—			2.4			2.0			1.5			3.2			6.4

(a)	Earnings before income tax, minority interest and cumulative effect of accounting change.
(b)	Equity earnings, net of dividends.
(c)	For the year ended December 31, 2000, earnings were insufficient to cover fixed charges in the amount of $27.6 million.